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Fair Value (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 6,811,368,000 |  | $ 6,811,368,000 |  | $ 6,794,671,000 |  |  |
expense related to other repossessed assets |  |  | 0 | $ 0 |  |  |  |
Alternative Investment | 43,579,000 |  | 43,579,000 |  | 26,384,000 |  |  |
Loans Held-for-sale, Fair Value Disclosure | 5,679,000 |  | 5,679,000 |  | 9,387,000 |  |  |
Impaired Financing Receivable, Carrying Value | 40,649,000 |  | $ 40,649,000 |  | 72,886,000 |  |  |
Discount percentage applied to real estate appraised values |  |  | 15.00% |  |  |  |  |
Discount percentage applied to lot development appraised values |  |  | 6.00% |  |  |  |  |
Partial Charge-Offs On Impaired Loans |  |  | $ 382,000 |  | 624,000 |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 1,874,000 |  | 1,874,000 |  | 1,616,000 |  |  |
Impaired Loan Fair Value | 2,732,000 |  | 2,732,000 |  | 1,103,000 |  |  |
Partial Charge-Offs On Impaired Loans carried at Fair Value |  |  | 162,000 |  | 240,000 |  |  |
Book Value Of Impaired Loans Carried At Fair Value | 3,892,000 |  | 3,892,000 |  | 1,291,000 |  |  |
Impaired Financing Receivable, carried at fair value, related expense | (1,000,000.0) | $ (400,000) | (1,000,000.0) | 500,000 |  |  |  |
MSR recorded at lower of cost or fair value | 16,470,000 | 14,316,000 | 16,470,000 | 14,316,000 | 15,264,000 | $ 15,704,000 | $ 13,635,000 | $ 12,210,000
Mortgage Servicing Rights Fair Value | 1,500,000 |  | 1,500,000 |  | 13,500,000 |  |  |
Valuation allowance of MSR | 232,000 | 2,112,000 | 232,000 | 2,112,000 | 1,568,000 | $ 1,126,000 | $ 2,337,000 | $ 3,189,000
MSRs recorded at cost | 15,000,000 |  | 15,000,000 |  | 1,800,000 |  |  |
Changes due to fair value adjustments | (894,000) | (225,000) | (1,336,000) | (1,077,000) |  |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 1,354,000 |  | 1,354,000 |  | 775,000 |  |  |
OREO valuation adjustments | 735,000 |  | 765,000 | 0 |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 20,300,000 |  | 20,300,000 |  | 8,400,000 |  |  |
Alternative Investment, income recognized | 90,000 | $ 506,000 | 2,500,000 | $ 1,900,000 |  |  |  |
Financing Receivable, Transfer to Held-for-Sale, Valuation Allowance, Expense |  |  | 1,200,000 |  |  |  |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Alternative Investment | 23,200,000 |  | 23,200,000 |  | 18,000,000 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 6,805,564,000 |  | 6,805,564,000 |  | 6,784,951,000 |  |  |
Impaired Loan Fair Value | 2,732,000 |  | 2,732,000 |  | 1,103,000 |  |  |
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 1,160,000 |  | 1,160,000 |  | 188,000 |  |  |
Financing Receivable, not collateral dependent [Domain] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Impaired Financing Receivable, Related Allowance | 714,000 |  | 714,000 |  | 1,428,000 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 2,732,000 |  | 2,732,000 |  | 1,103,000 |  |  |
Financing Receivable, Held for sale amortized cost | 1,400,000 |  | 1,400,000 |  |  |  |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Loans Receivable, Fair Value Disclosure | 2,732,000 |  | 2,732,000 |  | $ 1,103,000 |  |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 0 |  | $ 0 |  |  |  |  |

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